Select Product Size Variant
- From your Shopify admin, go to Online Store > Themes.
- Find the theme that you want to edit and click Customize.
- From the top bar drop-down menu, select the type of page that you want to edit.
- Click the Product Section to customize. Eg. Product pages default
- Go to COLOR AND SIZE SWATCHES.
- Click check Adding Size Swatches and Save. You may setting difference style of size swatch for diff product page template